<script src="__PUBLIC__/Home/js/jquery-1.11.1.min.js"></script>
<script type="text/javascript">
$(function () {
    $("#showValue").click(function () {
        $(":checkbox[name='sex'][checked]").each(function () {
            alert($(this).val());
        });
    })
});
</script>
<input type="checkbox" name="sex" value="男" />男
<input type="checkbox" name="sex" value="女" />女
<input type="checkbox" name="sex" value="Unknow" />Unknow
<input type="button" value="ShowSelectedValue" id="showValue" />